Not all aros are $$$. Silvers are by far the most abundant and cheapest, and max out at 3-4'.
Australians are a little more expensive, but affordable to the average person.
Africans are $$$, pretty rare.
Its the asian aros that are so damn expensive. Its because they are CITES protected and the only ones available are the farm bred ones.
BUT, generally aros are much more expensive than the average neon tetra.